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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 42 |
| 5 | 12 |
| 6 | 27 |
| 7 | 981 |
| 8 | 8487 |
| 9 | 38367 |
| 10 | 76383 |
| 11 | 312048 |
| 12 | 6754473 |
| 13 | 94180878 |
| 14 | 2922358131 |
| 15 | 56917353834 |
| 16 | 443166776019 |
| 17 | 3232915383357 |
| 18 | 62400967429185 |
| 19 | 5154511838165811 |
| 20 | 22613367632090301 |
| 21 | 123698372027088474 |
| 22 | 8246495954814631272 |
[1,2,6,42,12,27,981,8487,38367,76383,312048, 6754473,94180878,2922358131,56917353834, 443166776019,3232915383357,62400967429185, 5154511838165811,22613367632090301, 123698372027088474,8246495954814631272] |